Discuz! info: MySQL Query Error

SQL: select id, main, category, name, content, file, alt from tbmenu where lang = 3 and main = and status = 1 order by sort
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and status = 1 order by sort' at line 1
Errno.: 1064